Peruvian Journal of Agronomy 2021-11-18T13:56:28-05:00 Raúl Blas Open Journal Systems <p><strong>Scope</strong></p> <p>Peruvian Journal of Agronomy (e-ISSN: 2616-4477) is an international journal <strong>edited </strong>by the Universidad Nacional Agraria La Molina (UNALM). This journal publishes innovative and original research in the following areas of agricultural science: Entomology, Phytopathology, Plant Breeding, Horticulture, and Soil science. This journal publishes in American English for university audience as well as the general scientific community. The objective of the journal is to disseminate the results of research by Peruvian and foreign investigators, through scientific articles, which represent a contribution to the development of science and technology in our area.</p> <p><strong>About the journal</strong></p> <p>Our journal<strong> </strong><strong>doesn’t have any charges</strong> and publishes <strong>every four months (four-month periodicity):</strong> January to April (1), May to August (2), September to December (3). Peruvian Journal of Agronomy, an open-access journal, publishes under <span style="color: #0000ff;"><strong>CC BY license</strong></span>, and is included in <span style="color: #0000ff;"><strong>DOAJ, DIALNET</strong>, <strong>INDICE DE ACTUALIDAD IBEROAMERICANA </strong></span><span style="color: #111111;"> and <strong>LATINDEX</strong><strong> </strong><strong> </strong></span><strong><span style="color: #0000ff;">CATALOGO 2.0</span></strong></p> <p>All manuscripts submitted to Peruvian Journal of Agronomy are subject to a double-blind peer review process.</p> <p>Do you want to publish in our journal? Please review the <a href="">author guidelines </a>and <a href="">the sample</a>. The following documents must be submitted to <strong></strong>: cover letter and manuscript</p> Genetic behavior for seed yield and yield components in sesame (Sesamum indicum L.) under normal irrigation and water stress conditions 2021-09-15T04:17:06-05:00 Suzan Abd El- Latif Kamel Ibrahim Mohamed Ali Abdelsatar Mohamed Abd El-Raheem Ahmed Magdy M. Niazy <p>Six divergent genotypes of sesame (Sesamum indicum L.) were crossed using a half diallel excluding reciprocal crosses, to estimate heterosis, combining ability and nature of gene action for studied traits under two irrigation regimes. The two irrigation regimes were normal irrigation conditions with amount of applied water 5952.38 m3/ha and water stress conditions with amount of applied water 2976.19 m3/ha at Etay-El-Baroud Agricultural Research Station, Behaira governorate, Agricultural Research Center, Egypt during 2019 summer season. A randomized complete block design with three replications was used for each irrigation regimes. The variation of genotypes and their components from parents, crosses and parents versus crosses were highly significant for all studied traits under both irrigation regimes and their interactions with irrigation. Variation attributable to general and specific combining ability was highly significant for seed yield and yield components under both irrigation regimes. The parents L92 and L110 were the best combiners for seed weight per plant and most of its components under both irrigation regimes. The best F1 cross combination was L92 × L110 in specific combining ability and heterotic effects over mid- and better-parents under both irrigation regimes for seed weight per plant and most of its attributes. The preponderance of additive gene action in the inheritance of most studied traits was observed, that further confirmed by its significance and the value of average degree of dominance exceeding the unity. Narrow-sense heritability varied from 0.19 for number of branches per plant to 0.47 for 1000 seed weight under normal irrigation, whereas, under water stress conditions, it ranged from 0.14 for number of branches per plant to 0.42 for fruiting zone length. Parents L95 and L93 under normal irrigation and L93 and L110 under water stress conditions carried mostly genes with dominant effects for seed weight per plant, in contrary, L92 and L110 under normal irrigation and L92 and L12 under water stress conditions carried mostly recessive alleles for seed weight per plant. Hence, the results will be used to develop a sesame breeding scheme at Etay-El-Baroud Agricultural Research Station.</p> 2021-04-14T00:00:00-05:00 Copyright (c) 2021 Suzan Abd El- Latif Kamel Ibrahim, Mohamed Ali Abdelsatar, Mohamed Abd El-Raheem Ahmed, Magdy M. Niazy Control of Botrytis cinerea Pers. in ‘Okitsu’ Satsuma mandarin by biological and chemical fungicides in Huaura, Peru 2021-11-18T13:56:28-05:00 Denis Paolo Cáceres Candia Alejandro Risco Mendoza Patricia Elena Quiroz-Delgado Walter Eduardo Apaza-Tapia <p>The flowers blight caused by Botrytis cinerea Pers. is among the most important citrus diseases, especially in cultivars whose flowering coincides with the humid seasons of the year. As a result of the pathogenic features of this fungus and the complex nature of its control, it is necessary to establish a correct plan for the usage of highly efficient fungicides. The study aimed to evaluate the effect of four chemical fungicides, such as Captan (0.25%), Propineb (0.25%), Fludioxonil + Cyprodinil (0.05%), and Iprodione (0.15%); as well as the effect of a biological fungicide, such as Melaleuca alternifolia extract (0.1%), on Botrytis cinerea Pers. Two phases were established: the first, under laboratory conditions of Department of Plant Pathology of National Agrarian University-La Molina (UNALM), evaluated the effect on mycelial inhibition at 1, 3, and 7 days after inoculation with poisoned potato dextrose agar medium. The second, under field conditions (Sayan - Huaura), evaluated the effect on incidence of the disease in flowers. In the field condition, two applications, incidence, and humid chambers were evaluated. The yield was estimated by counting the fruits. The results showed that, under laboratory conditions, Captan, Fludioxonil + Cyprodinil, and Iprodione exhibited high efficacy in the control of B. cinerea. However, under field conditions, Fludioxonil + Cyprodinil and Iprodione exhibited a significant control of B. cinerea. A similar trend was obtained for the yield estimates.</p> 2021-04-15T00:00:00-05:00 Copyright (c) 2021 Denis Paolo Cáceres Candia, Alejandro Risco Mendoza, Patricia Elena Quiroz-Delgado, Walter Eduardo Apaza-Tapia Comparison of organic carbon from humic and fulvic acids and the degree of humification in five soil orders 2021-09-15T04:19:17-05:00 Sandro Sardón Nina Raúl D. Zapata Hernández Luis A. Arias López <p>This study compared the organic carbon (OC) content in fractions of humic acids (HA) and fulvic acids (FA) in five soil orders (Aridisol, Entisol, Histosol, Inceptisol and Mollisol) and know their association with the degree of humification. Extraction and fractionation, as well as the degree of humification was carried out by the Nagoya method proposed by Kumada. OC quantification was determined by the Walkley and Black method. The results are: the average OC content of HAs of the order Aridisol differs from that of Histosols, Inceptisols, and Mollisols. The order Entisol presented differences with the Histosols and Mollisols, the soils of the order Inceptisol presented differences with the Aridisols and Histosols and those of the order Histosol differed from the Aridisols, Entisols and Inceptisols. Similarly, those of the Mollisol order differed with the Aridisols, Entisols and Inceptisols. In the fraction of FA the average OC content of the order Aridisol deferred from that found in Histosols, Inceptisols and Mollisols. The Entisol order differed from the Mollisols; likewise, the Inceptisol order differed from the Aridisols and Mollisols and the Histosol order differed from the Aridisols. Finally, the order Mollisol was also different from the Aridisols, Entisols, and Inceptisols. Soil types do not show wetting patterns, because they are not based on pedogenetic processes and these have a wide range of characteristics in surface horizons.</p> 2021-04-30T00:00:00-05:00 Copyright (c) 2021 Sandro Sardón Nina, Raúl D. Zapata Hernández, Luis A. Arias López Favorable morphoclimatic factors for the preservation of wetting organic carbon in mountain soils 2021-09-15T04:20:13-05:00 Sandro Sardón Nina Raúl D. Zapata Hernández Luis A. Arias López <p>Humic substances (HS) are the main component of soil organic matter (SOM), a product of the pedogenetic process. In this study, the morphometric factors and climatic variable that condition the degree of humification, the organic carbon content of humic acids (HA) fulvic acids (FA) of 42 soil samples are related through the functional equation of factors of state of the soil proposed by Jenny. The degree of humification was determined by the Nagoya method proposed by Kumada. The quantification of organic carbon was determined using the method by Walkley and Black. The morphometric parameters of the relief were obtained from the Digital Elevation Model (DEM) and the climate parameter of the MODIS sensor. The results show that the relief factor conditions the degree of humification and the climate factor conditions the organic carbon content of humic acids (HA) and fulvic acids (FA).</p> 2021-04-30T00:00:00-05:00 Copyright (c) 2021 Sandro Sardón Nina, Raúl D. Zapata Hernández, Luis A. Arias López